Cant play steam games on my windows vista stock dell

Hello, ive never been able to play anny kind of advaned games on my pc, I can play AOE 2 rn, thats about it. ive been trying to play SW B2 and RC, but they wont start, I bought a cheap used video card on ebay, didnt help. any input would help, im a noob when it comes to troubleshooting pc probs, thanks!

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Hi.
Unclear about some stuff.
SW B2 do you mean the 2005 or the 2017 version?
RC - don't recognize - what is it?

You have an older machine (2007) which should run almost any game that is earlier, but may not run later games well. You have an older Windows version and some newer games may not work with that.Maintenance becomes important - like cleaning out dust and if temperature problems, cleaning old thermal paste and replacing with new.